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Bar Graphs and Histograms

Learn about bar graphs, double bar graphs, and histograms with detailed examples and steps on how to create and interpret these graphical representations of data.

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Bar Graphs and Histograms

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  1. Bar Graphs and Histograms PRINCESS C. BARCEGA APG SCHOOL, MANAMA, BAHRAIN Powerpoint hosted on www.worldofteaching.com Please visit for 100’s more free powerpoints

  2. What do you know about • bar graph? • double bar graph? • Histogram?

  3. Bar Graph • A bar graph can be used to display and compare data • The scale should include all the data values and be easily divided into equal intervals.

  4. How to interpret a Bar Graph? The bar graph shows Mr. Snowden’s students by gender and band membership. • How many of Mr. Snowden’s students are band members? • How many of Mr. Snowden’s students are not band members?

  5. Double Bar Graph • Can be used to compare two related sets of data

  6. How to make a Double-Bar Graph? • Choose a scale and interval for the vertical axis. • Draw a pair of bars for each country’s data. Use different colors to show males and females. • Label the axes and give the graph a title. • Make a key to show what each bar represents.

  7. The table shows the highway speed limits on interstate roads .within three states

  8. Step 1 • Choose a scale and interval for the vertical axis.

  9. Step 2 • Draw a pair of bars for each state’s data. Use different colors to show urban and rural.

  10. Step 3 and 4 Speed Limit on Interstate Roads • Label the axes and give the graph a title. • Make a key to show what each bar represents Urban Rural Speed Limit (mi/h)

  11. Histogram • Histogram is a bar graph that shows the frequency of data within equal intervals. • There is no space in between the bars.

  12. How to make a histogram?

  13. The table below shows the number of hours students watch TV in one week Make a histogram of all the data.

  14. Step 1 • Make a frequency table of the data. Be sure to use equal intervals

  15. Step 2 • Choose an appropriate scale and interval for the vertical axis. The greatest value on the scale should be at least as great as the greatest frequency.

  16. Step 3 • Draw a bar for each interval. The height of the bar is the frequency for that interval. Bars must touch but not overlap. • Label the axes and give the graph title

  17. Can you now make a bar graph, double bar Graph and a histogram?

  18. The list below shows the results of a typing test in words per minute. Make a histogram of the data. 62, 55, 68, 47, 50, 41, 62, 39, 54, 70, 56, 70, 56, 47, 71, 55, 60, 42

  19. The end

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